Human CellExp™CD4, human recombinant | 7834

Cluster of Differentiation 4 (CD4), also known as T-cell surface antigen T4/Leu-3 (LEU-3) and CD4mut, is a single-pass type I membrane glycoprotein, and is a member of the immunoglobulin superfamily. CD4 expressed on the surface of T helper cells, monocytes, macrophages, and dendritic cells. It has four immunoglobulin domains (D1 to D4) that are exposed on the extracellular surface of the cell: D1 and D3 resemble immunoglobulin variable (IgV) domains. D2 and D4 resemble immunoglobulin constant (IgC) domains. CD4 is a co-receptor that assists the T cell receptor (TCR) with an antigen-presenting cell. Using its portion that resides inside the T cell, CD4 amplifies the signal generated by the TCR by recruiting an enzyme, known as the tyrosine kinase lck, which is essential for activating many molecules involved in the signaling cascade of an activated T cell. CD4 also interacts directly with MHC class II molecules on the surface of the antigen-presenting cell using its extracellular domain. The extracellular domain adopts an immunoglobulin-like beta-sandwich with seven strands in 2 beta sheets, in a Greek key topology. CD4 has also been shown to interact with SPG21, Lck and Protein unc-119 homolog. CD4 is a primary receptor used by HIV-1 to gain entry into host T cells. HIV infection leads to a progressive reduction of the number of T cells possessing CD4 receptors. Therefore, medical professionals refer to the CD4 count to decide when to begin treatment for HIV-infected patients.

7834 | Human CellExpCD4 human recombinant DataSheet

Biomolecule/Target: CD4

Synonyms: CD4, CD-4, CD4mut, CD-4mut

Alternates names: Peroxiredoxin 2, NKEFB, PRP, PRX2, PRXII, TDPX1, TSA, PRDX2.

Taglines: Amplifies the signal generated by the T-Cell Receptor

NCBI Gene ID #: 7001

NCBI Gene Symbol: PRDX2

Gene Source: Human

Accession #: P32119

Recombinant: Yes

Source: E. coli

Purity by SDS-PAGEs: 90%

Assay: SDS-PAGE

Purity: N/A

Assay #2: N/A

Endotoxin Level: < 1.0 EU per g of the rhCD4 by the LAL method.

Activity (Specifications/test method): N/A

Biological activity: Specific activity: approximately 200-230 pmole/min/µg.

Results:

Binding Capacity: N/A

Unit Definition: N/A

Molecular Weight: 21.8 kDa

Concentration: N/A

Appearance: Lyophilized

Physical form description: Lyophilized from 0.22 m filtered solution in 50 mM Tris, 100 mM glycine, pH 7.5. Normally Mannitol or Trehalose are added as protectants before lyophilization.

Reconstitution Instructions: N/A

Amino acid sequence: MASGNARIGK PAPDFKATAV VDGAFKEVKL SDYKGKYVVL FFYPLDFTFV CPTEIIAFSN RAEDFRKLGC EVLGVSVDSQ FTHLAWINTP RKEGGLGPLN IPLLADVTRR LSEDYGVLKT DEGIAYRGLF IIDGKGVLRQ ITVNDLPVGR SVDEALRLVQ AFQYTDEHGE VCPAGWKPGS DTIKPNVDDS KEYFSKHN.